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AssigneeRobert Bosch GmbH
InventorReinhard Latsch
Estimating the term…
An internal combustion engine with externally supplied ignition is proposed, in which besides a main combustion chamber an ignition chamber is provided, which communicates with the main combustion chamber via a central discharge channel, which is disposed coaxially with the axis of the ignition chamber, and via additional discharge channels distributed about this discharge channel. Protruding into the coaxially disposed overflow channel is an electrode extending through the ignition chamber, this electrode being embodied as a heat pipe and forming a spark gap with the wall of the ignition chamber in the region of the overflow channel. As a result of its embodiment as a heat pipe, the electrode is protected against excessive heating and is simultaneously held to an optimal temperature.
An ignition chamber insert, comprising an elongated interiorly and exteriorly threaded body portion, said exteriorly threaded portion arranged to merge with a smooth surface portion capable of being received in sealing relation with means defining an aperture in an engine block, an electrode, an insulating body surrounding a portion of said electrode, said insert further including at least at one end, a centrally disposed aperture in said at least one end which receives said electrode of an ignition device in spaced relation therewith, another open end in said insert to receive said ignition device and a heating element in a chamber in said insert, said electrode is embodied as a slender heat pipe which extends from said insulating body into said aperture and said electrode is operated at a temperature below a glow ignition temperature and said heating element is disposed about said insulating body.
An ignition chamber insert for assembly with the main combustion chamber wall of an internal combustion engine, said ignition chamber insert including an ignition chamber having at least one primary discharge channel through said wall connecting said ignition chamber with said main combustion chamber and for passing an operating fuel-air mixture from said main combustion chamber to said ignition chamber, said ignition chamber insert having a spark-ignition device connectable to a voltage source and further including a first electrode said first electrode including a portion that extends through said ignition chamber including an end which forms a spark gap with said wall when voltage is applied, characterized in that said first electrode is embodied as a heat pipe, an insulating body surrounding a portion of said heat pipe, said heat pipe including a portion extending from said insulating body and arranged to protrude through the ignition chamber with its end in the vicinity of said wall area which surrounds said discharge channel and at that point said heat pipe end is at the shortest distance from the wall of the ignition chamber, thereby determining the location of the ignition spark whereby the temperature for cooling purposes at which said heat pipe operates to conduct heat from said end which protrudes through said insulating body to said insulator is below an auto-ignition temperature of the operating fuel-air mixture and the length of said heat pipe relative to its diameter is several times the diameter.
An internal combustion engine with externally supplied ignition comprising one main combustion chamber per cylinder and one ignition chamber per cylinder, said ignition chamber having a wall region associated with the main combustion chamber, said ignition chamber communicating with said main combustion chamber via at least one discharge channel in said wall region, said ignition chamber further being capable of being supplied via said at least one discharge channel with an operating fuel-air mixture and further comprising a spark-ignition device said spark ignition device comprising a first electrode which forms an ignition gap with said wall of said ignition chamber an insulating body surrounding a portion of said first electrode, characterized in that said first electrode is embodied as a heat pipe arranged with an end which protrudes through said insulating body and said ignition chamber into the vicinity of said wall region which surrounds said discharge channel and at this point said heat pipe is at the shortest distance from said wall region of the ignition chamber, thereby determining the location of the ignition spark whereby the temperature for cooling purposes at which said heat pipe operates to conduct heat from said end which protrudes through said insulating body to said insulator is below an auto-ignition temperature of the operating fuel-air mixture and the length of said heat pipe relative to its diameter is several times the diameter.
Dependencies are inferred from the claim text.